1. | A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is _____. |
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2. | A feather and a coin dropped in a vacuum fall with equal _____. |
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3. | An object that has potential energy has this energy because of its _____. |
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4. | When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______. |
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5. | Which of the following is not a unit for power? |
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6. | Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is _____. |
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7. | An object that has kinetic energy must be _____. |
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8. | Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. The faster arrow will penetrate _____. |
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9. | An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high it gains _____. |
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10. | How many Joules of energy are in one kilowatt-hour? |
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11. | A feather and a coin are dropped in the air. Each falls with equal _____. |
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12. | When a bullet is fired from a rifle, the force on the rifle is equal to the force on the bullet. However, the energy of the bullet is greater than the energy of the recoiling rifle because the _______. |
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13. | Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____. |
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14. | Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is _____. |
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15. | If an object has kinetic energy, then it also must have _____. |
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